A、<img width="32" height="39" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/2f68144f-4457-4f52-b9cd-87e60c717525.png" />
B、<img width="31" height="40" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/0ced4602-ade3-425e-b87d-5b24b091f86c.png" />
C、20
D、25